Android控制項之Spinner探究

以下類比下拉式清單的用法

布局檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:text="@string/ys" 
        android:id="@+id/TextView01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:textSize="28dip" />
<Spinner android:id="@+id/Spinner01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

SpinnerActivity類

package com.ljq.sp;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class SpinnerActivity extends Activity {
private Spinner sp = null;//下拉式清單
    private TextView tv = null;
// 所有資源圖片的數組
    private int[] drawableIds={R.drawable.football,R.drawable.basketball,R.drawable.volleyball};
// 所有字串的數組
    private int[] msgIds={R.string.zq,R.string.lq,R.string.pq};

    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        tv = (TextView) findViewById(R.id.TextView01);
        sp=(Spinner)this.findViewById(R.id.Spinner01);//初始化Spinner
        sp.setAdapter(adapter);
        sp.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int positon, long id) {
                LinearLayout ll = (LinearLayout) view;
                View v=ll.getChildAt(0);//擷取第一個控制項ImageView
                Log.i("ljq", v.getClass().getName());
                TextView tvn = (TextView) ll.getChildAt(1);//擷取第二個控制項TextView
                StringBuilder sb = new StringBuilder();
                sb.append(getResources().getText(R.string.ys)).append(":").append(tvn.getText());
                tv.setText(sb.toString());
            }

public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }

private BaseAdapter adapter = new BaseAdapter(){
public int getCount() {
return drawableIds.length;
        }

public Object getItem(int position) {
return drawableIds[position];
        }

public long getItemId(int position) {
return position;
        }

public View getView(int position, View convertView, ViewGroup parent) {
            LinearLayout ll = new LinearLayout(SpinnerActivity.this);
            ll.setOrientation(LinearLayout.HORIZONTAL);

            ImageView iv = new ImageView(SpinnerActivity.this);
            iv.setImageResource(drawableIds[position]);
            ll.addView(iv);

            TextView tv=new TextView(SpinnerActivity.this);
            tv.setText(msgIds[position]);//設定內容
            tv.setTextSize(24);
            tv.setTextColor(R.color.black);
            ll.addView(tv);
return ll;
        }
    };
}

運行結果